Sofa



FIG. 1 is a perspective view of the sofa;

FIG. 2 is a perspective view from the front of the sofa;

FIG. 3 is a perspective view from the right side of the sofa;

FIG. 4 is a rear view of the sofa; and,

FIG. 5 is a perspective view from the rear of the sofa. 

CLAIM The ornamental design for a sofa, as shown and described. 